Phase Design and Wires Cross Section Justification of Extra High Voltage Line

The paper presents the results of the analysis of the economic curves of overhead power lines with subsequent justification of the design of the power line. In the paper, economic curves are constructed for a line with a rated voltage of 750 kV. The cross-sections, the use of which is justified depending on the transmitted power, are determined. The analysis of the influence of design parameters on the occurrence of resonant overvoltages in non-sinusoidal overvoltages has been carried out. Three-dimensional graphs of dependences of overvoltage values on changes in the distance between phases and split wires are constructed.